Change name so that it can be published to the marketplace.

There's a GitHub user named 'autoformat', so we can't publish an action with that name :/

action.yml

@@ -1,4 +1,4 @@
-name: 'Autoformat'
+name: 'Autoformatter'
 description: 'Autoformat code using dotnet format'
 inputs:
   projects:  # id of input